best groovy/grails ide?

What is the best IDE for groovy/grails projects? I've been using IntelliJ, which has some nice features, but is expensive. Trouble is, as a newcomer to IntelliJ and Grails, there's not much in the way of documentation and tutorials to get you up and running. thanks!

Some Java User Groups give away a free license of IntelliJ each month.

IntelliJ has been pretty nice for me. It's been especially nice when doing Grails work because I can write a closure in a taglib class and then immediately have it available in my autocomplete list in GSPs. Much happiness.

Honestly? I use textpad. I've set up the tools menu to run the groovy interpreter when I press ctrl-1, and to run my test suites when I press ctrl-2. Syntax highlighting is very similar to Java's. I just googled and found a .syn file somewhere online.

For me, I can honestly say this is the best way to write groovy code. Maybe I'll see if IDEA is better at some point (picked up a license at No Fluff way back), but textpad seems to be just fine.